The loss of one of their own leaves the community reeling; and new security measures interfere with the work being performed by the scientists.

Frank clashes with Charlie to protect Babbit, who has become the subject of an investigation.

Both Charlie and Frank face serious questions as to the future of their projects.

An unexpected visitor arrives on the Hill.

Frank is offered a life-changing opportunity. At the same time, the U.S. Army put Charlie on the hot seat.